![]() ![]() In SQL Server, we create an auto-increment column using the IDENTITY statement. Now that we understand how the auto-increment feature works in SQL Server let us learn how we can implement it in SQL Queries. The id column auto-generates the next values (based on the interval) to accommodate the new data if a record is added. If there are 10 records, the id holds unique values from 1 to 10. Let us switch gears and understand what an auto-increment feature in SQL Server is.Īs the name suggests, Auto-increment is a type of field that auto-generates a unique numeric value for every record added to a database table.įor example, we can have an id column that generates a value for the number of records in the table. This prevents SQL Server from accepting null values in the primary key column. Notice we set the not null constraint to the column. The column contains integer values with a primary key constraint. Next, we create a simple table with one column only. ![]() In the example query above, we start by switching databases using the use statement in T-SQL. How to create a primary keyĬonsider the example query below that shows how to create a simple table with a primary key constraint. Now that we have the basics of a primary key let us understand how we can create one.
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